ADHD is usually a childhood diagnosis, although, it is not uncommon for a young adult to present with symptoms that have been present (but have now worsened) from their early years.
More often than not, ADHD co-exists with mood or anxiety disorders, tic disorders or pervasive disorders (such as, autism spectrum disorders). ADHD symptoms also range from increased physical / mental activity, difficulties with concentration/ memory, social/ behavioural difficulties to problems carrying out complex tasks (involving multiple steps) and verbal and non-verbal language.
Because of the complex and varied nature of ADHD, it is very important that a thorough history, examination and investigations are carried out prior to discussing treatment options. Treatment should ideally take a multi-factorial approach, utilising psychological interventions, as well as, medication if/as required.